/*
 * Copyright (C) 2009 Georgios J. Georgopoulos, All rights reserved.
 * 
 * This is free software; you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 3 of the License, or (at your option) any
 * later version.
 * 
 * This software is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 * details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with this software; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA, or see the FSF
 * site: http://www.fsf.org.
 */
package org.gwt.mosaic.xul.client.ui;

import com.google.gwt.user.client.ui.MenuBar;
import com.google.gwt.user.client.ui.MenuItem;
import com.google.gwt.user.client.ui.Widget;

/**
 * A container for menu elements. All non-menu elements inside the menubar will
 * be ignored.
 * 
 * @author georgopoulos.georgios(at)gmail.com
 * 
 */
public class Menubar extends Container {
  private static final long serialVersionUID = 918313318605271819L;

  private transient MenuBar menuBar = null;

  // -----------------------------------------------------------------------
  public Menubar() {
    super();
  }

  // -----------------------------------------------------------------------
  @Override
  public Element add(Element element, int index) {
    if (element instanceof Menu) {
      return super.add(element, index);
    }
    return null;
  }

  // -----------------------------------------------------------------------
  @Override
  protected Widget createUI() {
    if (menuBar == null) {
      menuBar = new MenuBar();
      menuBar.setAnimationEnabled(true);
    }

    syncUI(menuBar);

    return menuBar;
  }

  // -----------------------------------------------------------------------
  @Override
  protected void syncUI(Widget ui) {
    super.syncUI(ui);

    menuBar.clearItems();

    for (int i = 0, n = getElementCount(); i < n; i++) {
      final Menu menu = (Menu) getElement(i);
      menuBar.addItem(new MenuItem(menu.getLabel(), (MenuBar) menu.getUI()));
    }
  }

}
